I have found a Ludwig Schvadlenka in Vienna in 1905. He was 19 at that time and from Skalica. I had looked at the Skalica records, both on film and on the internet, I couldn't find any Anna Schvadlenka who would match with my Ludwig's mother.
It would be interesting if this was the same Ludwig Schvadlenka even if he isn't related.
PJS